JEE MAIN - Chemistry (2020 - 5th September Evening Slot)
1
The volume, in mL, of 0.02 M K2Cr2O7 solution
required to react with 0.288 g of ferrous
oxalate in acidic medium is _______.
(Molar mass of Fe = 56 g mol–1)
Answer
50
2
The number of chiral carbons present in
sucrose is _____.
Answer
9
3
For a dimerization reaction,
2A(g) $$ \to $$ A2(g)
at 298 K, $$\Delta $$Uo
= –20 kJ mol–1, $$\Delta $$So
= –30
JK–1 mol–1, then the $$\Delta $$Go
will be _____ J.
Answer
-13540to-13537
4
Considering that $$\Delta $$0
> P, the magnetic moment (in BM) of [Ru(H2O)6]2+ would be _________.
Answer
0
5
For a reaction X + Y ⇌ 2Z , 1.0 mol of X, 1.5 mol of Y and 0.5 mol of Z were taken in a 1 L
vessel and allowed to react. At equilibrium, the concentration of Z was 1.0 mol L–1. The equilibrium constant of reaction is $${x \over {15}}$$. The value of x is _________.
Answer
16
6
The increasing order of boiling points of the following compounds is :
Answer
(C)
I < IV < III < II
7
The correct order of the ionic radii of O2–, N3–, F–
, Mg2+, Na+ and Al3+ is :
Answer
(D)
Al3+ < Mg2+ < Na+ < F–
< O2– < N3–
8
Consider the complex ions,
trans-[Co(en)2Cl2]+ (A) and cis-[Co(en)2Cl2]+ (B).
The correct statement regarding them is :
Answer
(C)
(A) can not be optically active, but (B) can
be optically active.
9
Lattice enthalpy and enthalpy of solution of NaCl are 788 kJ mol–1, and 4 kJ mol–1, respectively.
The hydration enthalpy of NaCl is :
Answer
(B)
–784 kJ mol–1
10
Among the following compounds, geometrical isomerism is exhibited by :
Answer
C
D
11
The major product of the following reaction is :
Answer
(C)
12
The final major product of the following reaction is :
Answer
(B)
13
The variation of molar conductivity with concentration of an electrolyte (X) in aqueous solution
is shown in the given figure.
The electrolyte X is :
Answer
(B)
CH3COOH
14
The rate constant (k) of a reaction is measured at differenct temperatures (T), and the data are
plotted in the given figure. The activation energy of the reaction in kJ mol–1 is :
(R is gas constant)
Answer
(B)
2R
15
The compound that has the largest H–M–H bond angle (M = N, O, S, C) is :
Answer
(A)
CH4
16
The correct statement about probability density (except at infinite distance from nucleus) is :
Answer
(B)
It can be zero for 3p orbital
17
Boron and silicon of very high purity can be obtained through :
Answer
(C)
Zone refining
18
The major product formed in the following reaction is :
CH3CH = CHCH(CH3)2 $$\buildrel {HBr} \over
\longrightarrow $$
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